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Detection of MET Alterations Using Cell Free DNA and Circulating Tumor Cells from Cancer Patients

2020; Multidisciplinary Digital Publishing Institute; Volume: 9; Issue: 2 Linguagem: Inglês

10.3390/cells9020522

2073-4409

Patricia Mondelo‐Macía, Carmela Rodríguez-López, Laura Valiña, Santiago Aguín, Luís León, Jorge García, Alicia Abalo, Óscar Rapado‐González, María Mercedes Suárez‐Cunqueiro, Ángel Díaz‐Lagares, Teresa Curiel, Sílvia Calabuig-Fariñas, Aitor Azkárate, Antònia Obrador‐Hevia, Ihab Abdulkader, Laura Muinelo‐Romay, Roberto Díaz‐Peña, Rafael López‐López,

Genetic factors in colorectal cancer

MET alterations may provide a potential biomarker to evaluate patients who will benefit from treatment with MET inhibitors. Therefore, the purpose of the present study is to investigate the utility of a liquid biopsy-based strategy to assess MET alterations in cancer patients. We analyzed MET amplification in circulating free DNA (cfDNA) from 174 patients with cancer and 49 healthy controls and demonstrated the accuracy of the analysis to detect its alteration in patients. Importantly, a significant correlation between cfDNA concentration and MET copy number (CN) in cancer patients (r = 0.57, p <10-10) was determined. Furthermore, we evaluated two approaches to detect the presence of MET on circulating tumor cells (CTCs), using the CellSearch® and Parsortix systems and monitored patients under anti-EGFR treatment (n = 30) combining both cfDNA and CTCs analyses. This follow-up provides evidence for the potential of MET CN assessment when patients develop resistance to anti-EGFR therapy and a significant association between the presence of CTCs MET+ and the Overall Survival (OS) in head and neck cancer patients (P = 0.05; HR = 6.66). In conclusion, we develop specific and noninvasive assays to monitor MET status in cfDNA/CTCs and demonstrate the utility of plasma MET CN determination as a biomarker for monitoring the appearance of resistance to anti-EGFR therapy.